Traction-wheel.



H. E. BULLOCK. TRACTION WHEEL.

APPLICATION FILED SEPT. 26. 1914.

Patented Jan. 12, 1915 I iiifiliiiriiz 1N VEZV TOR. 2J2: $907404"; BY MW at;

ATTORNEYS.

WITNESSES: W J

to provide HENRY E, BOLIIOGK, OF CKICAGO, ILLINOIS, ASSIGNOE TO BULLOCK TRACTOR CHICAGO, ILLINOIS, A CORPORATION 01? ILLINOIS.

' TRACTION-WHEEL.

Specification of Letter: Iaunt.

Patented Jan.'12, 1915.

Application filed eptemlier 26, 1.914. Serial No. 863,779.

To all whom it mag ,1 oncemr.

Be it known that I, HENRY E. BnLwcK, of Chicago, in the countypf Cook and State of lllinols, have invented certain new and useful Improvements in Traction-Wheels; and 1 do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full,- clear, and exact specification, which will enable others skilled in the art to which my said invention appertains or with which it is closely connected to make and use thesame.

This invention has general reference to traction wheels, and while adapted for use in 'all kinds of cast car, and similar wheels, it is especially applicable to bearing wheels, such as are employed in traction engines of self-laying track type, that run upon said endless tracks and that support the upper or slackruns of such endless tracks.

Its object is to enhance the durability of such traction wheels and-to render repairs thereof comparatively inexpensive.

To attainthis object my invention con:

sists in the production of a wheel of such hardness that ordinary machining thereon is difiicult and practically impossible, and the same with a removable core or bushing of a softer metal capable of being readily machined. An example of such a wheel is shown in the accompanying drawings, which serve to illustrate my invention more fully, and in which- Figure 1 is a longitudinal sectionmh elevation, and Fig. 2 's a sectional elevaticm on lineEZ-Z of Fig. 1 of the same. Fig 3 is likewise a longitudinal sectional elevation of my improved wheel illustrating nieans for holding the central bushing in position, and Fig. 4 is an end-elevation of the same.

Like parts are designated by the same characters and symbols of reference in all the figures.

A in these drawings designates a car, or

'other wheel, having the usual tread 16. and

flange 17. This wheel, as usually made in cast iron has a central bore 18, for the reception of an axle, which bore is. machined in order to fit said axle either by a driving, or a rotating fit. Such a wheel cannot be successfully produced in casting except in a metal, capable of'being machine-bored to receive said axle, and therefore, the life of such a wheel is limited; and to increase its durability the tread and inner flank of the flange, are usually chilled. This method of procedure, however, is not sul'licient in case of a wheel, such as a bearing wheel.

in tractors of the endless track type where the tread of the wheel rolls, nearly contimbously, on a sandy or gritty track andis soon worn to such an extent as to make its fur-j ther use impossible. To overcome this objection I cast the body of the wheel in whiteiron; being the metal used in the production of malleable iron, which, owing to its extreme hardness, is especially capable of resistmg wear and cannot be machined; and in thiscasting I provide centrally a bore larger than that required for the axle and.

secure in this bore a bushing of metal capableof being readily machined. This latter bhshing 19, maybe of soft gray iron, brass] bronze, or other suitable metal capable of being bored and faced, and it may be permanently secured in the wheel by placing a previously prepared bushing into the mold and then casting the wheel in hard iron around said bushing, after which the bushipg may be finally bored to receive the axle. This wheel possesses a life many times-that of a chilled,oraso'ft-tread wheel, and is as cheap, if not cheaper than these wheels,

My method of producing these wheels is especially well adapted to the production of twin-wheels, so called, being a pair of trac- -tion wheels in spaced relation, united, in-

tegrally, by a hub, 20, as shown in Figs. 1 and 3. In order to produce this ss of wheels when designed to rotate on the axle, in contradistinction to the usualcar wheels in which the wheels are fixed to theaxl and the latter rotated in hearings) in which case the wear of the bearing. in the wheel would soon render the wheel defective and useless, I provide thesame with a removable bushing 19, and fasten this bushing in the wheel in such a manner that the bushing may be removed and replaced when worn, thereby producin quite a saving in cost of repairing these w eels. To accomplish this result I core the wheel larger than the external diameter of the bushing 19, and hold this bushing in position by a series of bolts 21, as shown at the ri ht of Fig. 3, or by other similar means. prefer, however, to

hold this bushing in place b pouring a soft metal composition that wil melt at a comparatively low heat, such as Babbitt metal and the like; in the space betweenthe bushing and the core-opening in the wheel, a method which is extremely inexpensive, since, when it is desired to renew a bushing, the wheel may be heated to melt the lining, to withdraw the worn bushing, the softmetal being suitable for re-use and hence no expense connected'with its employment.

It will now be observed that by m resent method of producing these whee s, do not need to bore the wheel proper, nor ma- I chine the outside of the bushin the only machinin necessary being the c ucking of the whee after the bushing has been secured in the hub, and then boring the bush- HENRY E. BULLOCK.

\Vitnesses:

J. M. HEDLUND, Micnnnn J. STARK.

Copies of thll patent may be obtained for Me cents each. by addressing the Commissioner of Patents.

Washington. D. C." 

